Probably 1, however I can see why that would be a tiny bit confusing.
Building walls protects from incoming invaders(at least back in the day), creating armies, makes a force to go and fight to protect the people, and what was the other one? Oh yea, moving to a safer place.
Doing that would mean making invasions less likely, and making your people feel and be safer.
Hope this helps.
It increased our territory 2x or even 3x for only a little amount of money. So it was an unbelievable deal
The microscope by using tiny glass leanse to see the cells.
